straightforward guidance and be able to focus on other things, like each other, which isn't rocket science. it's just common sense. from td ameritrade. [heart beating] [heartbeat continues] [heartbeat, music playing louder] ♪ i'm feeling better since you know me... ♪ announcer: this song was created with heartbeats of children in need. find out how it can help frontline health workers bring hope to millions of children at everybeatmatters.org. >>> we've shown you flukes and blunders counting down 25 shocking medical mistakes. radical radiation made our list at number 5. at number 4, infection infestation. skydiver josh nahum parachutes to earth. the landing goes badly. josh's leg breaks. his skull fractures. he's on the mend in the hospital when he catches an infection from the hospital. >> nobody ever thinks that they're going to go into a hospital only to be made more ill. >> doctors are powerless to fight the bacteria raging through josh's body. >> what we're seeing now, and it's really concerning, is there's a growing list of gram negative bacteria that are resistant to many if not